Acts 13:48 - New International Version (NIV)
"When the Gentiles heard this, they were glad and honored the word of the Lord; and all who were appointed for eternal life believed."
Acts 13:48 - Young's Literal Translation (YLT)
"And the nations hearing were glad, and were glorifying the word of the Lord, and did believe -- as many as were appointed to life age-during."
from - https://www.biblegateway.com/passage/?search=acts%2013:48&version=NIV;NKJV;KJV;AMPC;YLT
The original word which was translated "eternal" in the NIV and "age-during" in the Young's Literal is:
"aionios - G166 - from 165 - aion - an age"
The Strong's Concordance (the book) adds "by extension perpetuity.. by implication the world.. age, course, eternal, (for) ever (more)..." all the way to "began, without end"
And an online version (of Strong's) says this -
From G165; perpetual (also used of past time, or past and future as well)
KJV Usage: eternal, for ever, everlasting, world (began).
Totally leaving out "age" from the Greek word "aion".